// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/ozone/platform_selection.h"

#include "base/command_line.h"
#include "base/logging.h"
#include "ui/ozone/platform_list.h"
#include "ui/ozone/public/ozone_switches.h"

namespace ui {

namespace {

    // Returns the name of the platform to use (value of --ozone-platform flag).
    std::string GetPlatformName()
    {
        // The first platform is the default.
        if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
                switches::kOzonePlatform)
            && kPlatformCount > 0)
            return kPlatformNames[0];
        return base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
            switches::kOzonePlatform);
    }

    int g_selected_platform = -1;

} // namespace

int GetOzonePlatformId()
{
    if (g_selected_platform >= 0)
        return g_selected_platform;

    std::string platform_name = GetPlatformName();

    // Search for a matching platform in the list.
    for (int platform_id = 0; platform_id < kPlatformCount; ++platform_id) {
        if (platform_name == kPlatformNames[platform_id]) {
            g_selected_platform = platform_id;
            return g_selected_platform;
        }
    }

    LOG(FATAL) << "Invalid ozone platform: " << platform_name;
    return -1; // not reached
}

const char* GetOzonePlatformName()
{
    return kPlatformNames[GetOzonePlatformId()];
}

} // namespace ui
